html, body {
    width: 100%;
    max-width: 750px;
    height: 100%;
    padding: 0;
    margin: 0 auto;
}

* {
    box-sizing: border-box;

}

div {
    font-size: px2rem(28);
}

img[lazy=loading] {
    width: 50px;
    height: 50px;
    margin: auto;
}